1. Enter your input
Paste text, code, data, or the value you want to inspect.
Regex Tester
Test regular expressions against sample text, inspect match positions, preview highlighted matches, and copy matched values for debugging parsers, validations, and search rules.
2. Run the tool
Format, encode, decode, validate, test, or generate the result instantly.
3. Copy the output
Use the cleaned result in your code, docs, API workflow, or notes.
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When to test a regular expression
Regex testing helps validate patterns for form fields, parsing rules, search tools, log filters, route matching, and text extraction.
Popular regex searches
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Regex Tester FAQ
What is a regular expression?
A regular expression is a pattern used to match, search, validate, or extract text.
Why is my regex not matching?
Common causes include missing flags, escaped characters, anchors, whitespace, or a pattern that is too strict.
Can I see all matches?
Yes. The tester shows matched text and helps inspect match results.